Maths: subtraction

Today we moved away from addition and started to look at subtraction. We practised mental methods of subtraction. Mental methods are different from written methods. When subtracting mentally, we can subtract the tens first, and then the units. For example, to subtract 19 from 44, we can subtract 10 first. That leaves us with 34. Then we can subtract 9, which leaves 25. Another method is to subtract 20, which leaves 24, and then add 1, which makes 25. Yet another way is shown on the board above. The way on the board is really good for numbers that are not too far apart. Never try to do a written method (columns of units and tens) in your head. Always use a mental method for mental maths. It is much quicker and you are less likely to make a mistake.

At home please do page 26 questions 1 and 2 only. Enjoy doing your homework. Do not rush. Check your answers.